ACT 2011 Pro Outlook Addin Won't Load

Having problems getting the ACT Outlook Addin to load, it always appears as an inactive addin and you can tick it and click ok but it never loads, it gives a runtime error. I've patched ACT to SP1 and Hotfix 6, been all through the Answer ID: 23022, done a repair on Office. It is only 1 pc in a company running ACT on 7 pc's in total. The ACT addins appear in all other Office applications, just not Outlook.